[ReelMagic]

The only time the "waste Pump out" switch is used is when dumping off shore and the through the hull waste valve is open (at least that's the way my 38 Open is configured). When pumping out through the deck pump fitting out you need to ensure the 3 way valve (not sure where it is on the 39) is valved to deck pump out.... When pumping out using the deck pump out at a marine waste dumping facility a vacuum pump will suck out the sewerage.. M2C